Josh Baskin would do anything to be big to hang out with his crush at the carnival. He finds a Zoltar machine, and he wishes to be big. After Zoltar tells him, "his wish is granted", Josh notices the machine is unplugged. He wakes up the next morning in an adult's body but he still has the same personality. With the help of his best friend, Billy, Josh learns how to act like a grown up. But as he gets a girlfriend and a fun job, he doesn't want to be a kid again. Will Josh stay big or become a 13 year old boy again?